Mechanical Properties of Bi2−xCdxPb0.3Sr2Ca2Cu3O10+δ superconductors

Abstract

Solid state reaction methods were used to prepare a high temperature superconductor with a nominal composition Bi2−xCdxPb0.3Sr2Ca2Cu3O10+δ for (0≤x≤ 0.5). The prepared samples have been investigated through X- ray diffraction measurements to determine structural properties. Superconducting properties by dc electrical resistivity and mechanical properties by static Vickers hardness measurements have been carried out to assess the effects of Cd substitution. X-ray diffraction analysis showed two phases: high-TC phase 2223 and low-TC phase 2212 with orthorhombic structure for all samples. The optimum concentration was found for 0.2 which improved the microstructure and had the highest TC value 126 K for maximum ratio of c/a. Cd doping increased Vickers hardness, Young’s modulus and yield strength values. Load dependent values of Hv, E, and Y are greater than those of the load independent values. Possible reasons for the observed improvements in the superconducting and mechanical properties due to Cd substitution are discussed.